The LTC3803ES6-5#TRPBF is a constant frequency current mode flyback controller optimized for driving N-channel MOSFETs in high input voltage applications. Constant frequency operation is maintained down to very light loads, resulting in less low frequency noise generation over a wide range of load currents. Slope compensation can be programmed with an external resistor.

The LTC3803ES6-5#TRPBF provides ±1.5% output voltage accuracy and consumes only 240μA of quiescent current. Ground-referenced current sensing allows LTC3803-based converters to accept input supplies beyond the LTC3803’s absolute maximum VCC. A micropower hysteretic start-up feature allows efficient operation at high input voltages. For simplicity, the LTC3803ES6-5#TRPBF can also be powered from a high VIN through a resistor, due to its internal shunt regulator. An internal undervoltage lockout shuts down the LTC3803ES6-5#TRPBF when the input voltage is too low to provide sufficient gate drive to the external MOSFET.

The LTC3803ES6-5#TRPBF is available in a low profile (1mm) 6-lead SOT-23 (ThinSOT™) package.

Turn On VoltageFrequencyLTC38038.7V200kHzLTC3803-38.7V300kHzLTC3803-54.8V200kHz

VIN and VOUT Limited Only by External Components

Adjustable Slope Compensation

Internal Soft-Start

Constant Frequency 200kHz Operation

±1.5% Reference Accuracy

Current Mode Operation for Excellent Line and Load Transient Response

No Minimum Load Requirement

Low Quiescent Current: 240μA

Low Profile (1mm) SOT-23 Package

Telecom Power Supplies

42V and 12V Automotive Power Supplies

Auxiliary/Housekeeping Power Supplies

Power Over Ethernet